fix: bump Hugo version to 0.156.0 for hugo.Data support

Templates use hugo.Data (introduced in 0.156.0) instead of the
older site.Data accessor.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: dylanreed

.github/workflows/deploy.yml

@@ -25,7 +25,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     env:
-      HUGO_VERSION: 0.141.0
+      HUGO_VERSION: 0.156.0
     steps:
       - name: Install Hugo CLI
         run: |